Kohaku is often noted how closely she resembles her older sister. Kohaku has rosy cheeks and a cute and round-looking face. Like Sapphire, she has messy, wavy, short, gold-ish hair. She also has a piece of her hair pointing up. Kohaku has green-ish, lime eyes and quite thick eyebrows. She also wears a blue ribbon.
Kohaku is a shy and timid girl. She also tends to be childish and expressionless sometimes. But she is friendly and soft spoken, and has good manners, just like her sister.